package com.mdl.springmvc.handler.interceptors;

import org.apache.log4j.Logger;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Desc
 * @Author madengling
 * @Time 2020/12/10 16:26
 */
public class FirstInterceptor implements HandlerInterceptor {
    private static Logger logger = Logger.getLogger(FirstInterceptor.class);

    /**
     * 该方法在目标方法之前被调用
     * 若返回值为true，则继续调用后续的拦截器和目标方法
     * 若返回值为false，则不会再调用后续的拦截器和目标方法
     *
     * 可以考虑做权限。日志，事务等。
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        logger.info("[FirstInterceptor] preHandle");
        return true;
    }

    /**
     * 调用目标方法之后，但渲染视图之前被调用
     *
     * 可以对请求域中的属性或视图做出修改。
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        logger.info("[FirstInterceptor] postHandle");
    }

    /**
     * 渲染视图之后被调用
     *
     * 释放资源
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        logger.info("[FirstInterceptor] afterCompletion");
    }
}
